The fan I have now is the stock 7 blade 18 inch and I am running the Mr. Gasket 160 degree thermastat. I have been running a 160 for probably 9 years now. Prior to the rebuild it never got past 190. I have read where some say it's best to run the 180 and some say 160 doesn't hurt anything. I will fix the timing later this week and see how it does at after that. I know I should try to get about 18-20 degrees at idle and 33-35 full advance. That is so far the plan. Joe M, what kind of dist. and advance springs are you running to get those numbers?